Null geodesics in Kerr

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Written by Blazej Ruba

Joint work with: Claudio Paganini

We consider null geodesics in the domain of outer communication of a sub-extremal Kerr spacetimes. We will show, that most fundamental properties of null geodesic motion can be read off from a plot of the radial pseudo potential. In particular one can see immediately that the ergoregion and trapping are separated in phase space.